Chaco Canyon, a settlement of the ancient Anasazi culture in North America, had massive buildings. It must have been a major Anasazi center. Analysis of wood samples shows that some of the timber for the buildings came from the Chuska and San Mateo mountains, 50 miles from Chaco Canyon. Only a major cultural center would have the organizational power to import timber from 50 miles away.
In the argument given, the two portions in boldface play which of the following roles?
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AThe first is a premise used to support the argument's main conclusion; the second is the argument 's main conclusion.
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BThe first is the argument's main conclusion; the second is a premise used to support that conclusion.
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CThe first is one of two premises used to support the argument's main conclusion; the second is the other of those two premises.
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DThe first is a premise used to support the argument's main conclusion; the second is a premise used to support another conclusion drawn in the argument.
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EThe first is inferred from another statement in the argument; the second is inferred from the first.
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